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BECA 86C

BECA 86C

Description

The BECA 86C profile is a shaft seal machined from virgin or filled PTFE and is made up of a primary lip for dynamic sealing against the main fluid, an anti-pollution lip, and an O-ring for static sealing. The primary sealing lip can be delivered preformed by a mandrel depending on the mounting direction.
As the sealing lip is not spring-loaded, this allows the profile to operate at higher speeds.

Advantages

Low coefficient of friction, no stick-slip effect when starting
Excellent abrasion resistance
Effective in dry or poorly lubricated environments
Excellent chemical inertness

Technical data

Temperature

-15°C/+120°C

Pressure

Dynamic: 0.15 MPa

Speed

30 m/s

PV maximum

PV (m/s x MPa) 2.6 in lubricated medium
PV (m/s x MPa) 1.30 in dry environment

Applications

Aeronautics
Food industry
General industry
Medical
Electric motors
Motors and pumps
Robotics

Materials

Profiled joint

Virgin PTFE
Carbon filled PTFE
Graphite filled PTFE
PTFE filled with glass fibers + MOS2

O'ring

NBR 70 Shore A
FKM 70 Shore A
EPDM 70 Shore A
HNBR 70 Shore A
VMQ 70 Shore A

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Dimensions
Materials
Conditions
for use
Shaft design
Housing design
Assembly recommendations

Dimensions

Installation drawingSchema_implantation_86C

Materials

Friction ring O'ring Contact surface
Code standard Code ISO Material Color Features Code Nature of the material Operating temperature*
DP P Virgin PTFE  White Chemical resistance
Impermeability
Dielectric
Anti-stick
Low friction coefficient
Eating		 K6

NBR 70

Shore A

 -15°C / +100°C Steel
Stainless steel
Chrome steel
Aluminum
Bronze
Cast iron
Treated surface
G6

FKM 70

Shore A

 -15°C / +120°C
C6 EPDM 70 Shore A -15°C / +120°C
F6 VMQ 70
Shore A 		 -15°C / +120°C
DC C PTFE
+ 25% Carbon		 Grey

Improvement

  • Wear properties
  • Compression resistance

Good resistance to chemicals
Thermal and electrical conductivity
Anti-static

Powerful in applications 
dynamic with compression

 K6 NBR 70 Shore A -15°C / +100°C
G6 FKM 70 Shore A -15°C / +120°C
C6 EPDM 70 Shore A -15°C / +120°C
CG C PTFE
+ 23% Carbon
+ 2%Graphite		 Black K6 NBR 70 Shore A -15°C / +100°C
G6 FKM 70 Shore A -15°C / +120°C
C6 EPDM 70 Shore A -15°C / +120°C
DV V PTFE
+ 25 % Glass		 Blue

Improvement

  • Wear properties
  • Mechanical outfit

Slightly more abrasive but phenomenon
corrected by the addition of MOS2
Chemical and dielectric properties preserved

Well suited to motion applications
simultaneous rotating and reciprocating

 K6 NBR 70 Shore A -15°C / +100°C Steel
Chrome steel
Cast iron
G6 FKM 70 Shore A -15°C / +120°C
VM M PTFE
+ 15 % Glass
+ 5% MoS2		 Grey K6 NBR 70 Shore A -15°C / +100°C
G6 FKM 70 Shore A -15°C / +120°C
DG G PTFE
+ 15% Graphit		 Black Improvement

 

  • Wear properties
  • Reduced wear of metal parts

Self-lubrication
Thermal and electrical conductivity
Low permeability
Good coefficient of friction
Anti static

Powerful in applications
dynamic with self-lubrication

 K6 NBR 70 Shore A -15°C / +100°C Steel
Stainless steel
Chrome steel
Aluminum
Bronze
Cast iron
Treated surface
G6 FKM 70 Shore A -15°C / +120°C
C6 EPDM 70 Shore A -15°C / +120°C
DB B PTFE
+ 60% Bronze		 Dark brown Improvement

 

  • Wear properties
  • Resistance to deformation and creep

Compressive strength
Self-lubrication
Electrical and thermal conductivity
Does not alter metal parts
Loss of hold with certain chemicals

Use for dynamic seals with high compression and low wear levels

 K6 NBR 70 Shore A -15°C / +100°C Steel
Chrome steel
Cast iron
G6 FKM 70 Shore A -15°C / +120°C
B4 B PTFE
+ 40% Bronze		 Dark brown K6 NBR 70 Shore A -15°C / +100°C
G6 FKM 70 Shore A -15°C / +120°C

* Limited in temperature due to potential sealing losses due to thermal expansion of materials on joint profiles without metal support.
Other qualities of materials are available depending on your particularities.

Conditions for use

4.EN_Courbe_temperature

Shaft design

Schema_implantation_86C

Shaft material


Suitable materials are:

  • Steels common in mechanical construction type C35 and C45
  • Stainless steels type 1.4300 and 1.4112 for watertightness
  • Aluminum
  • Cast iron
  • Plastic materials

 

Shaft hardness


The hardness of the shaft will depend on the linear speed (in m/s) and the level of the environment.

HRC hardness Rotation speed  
Environement v ≤ 2,5 m/s v ≤ 5,0 m/s v ≤ 10,0 m/s v ≤ 15,0 m/s v ≤ 20,0 m/s v ≤ 25,0 m/s v ≤ 30,0 m/s
Lubricated 35 40 52 58 58 62 62
Dry 40 52 58 60 62 62 62
Water 40 40 40 40 40 40 40
Abrasive 58 62 62 62 62 62 62

Surface conditions

The surface quality of the tree must take into account the recommendations below.

Standard conditions:

  • Ra = 0.1 to 0.2 µm 
  • Rz = 1.0 to 3.0 µm

 

Shaft tolerance

The shaft must be of tolerance h11 according to ISO 286-2

Shaft diameter

Ød1 (mm)

 Tolerance
h11 (mm)
Ød1 ≤ 3,0 -0,060 / 0
3,0 < Ød1 ≤ 6,0 -0,075 / 0
6,0 < Ød1 ≤ 10,0 -0,090 / 0
10,0 < Ød1 ≤ 18,0 -0,110 / 0
18,0 < Ød1 ≤ 30,0 -0,130 / 0
30,0 < Ød1 ≤ 50,0 -0,160 / 0
50,0 < Ød1 ≤ 80,0 -0,190 / 0
80,0 < Ød1 ≤ 120,0 -0,220 / 0
120,0 < Ød1 ≤ 180,0 -0,250 / 0
180,0 < Ød1 ≤ 250,0 -0,290 / 0
250,0 < Ød1 ≤ 315,0 -0,320 / 0
315,0 < Ød1 ≤ 400,0 -0,360 / 0
400,0 < Ød1 ≤ 500,0 -0,400 / 0

Chamfer and Radius


To avoid altering the primary lip of the sealing ring during assembly, it is strongly recommended to provide a chamfer on the shaft. Please refer to the table below.

Shaft diameter
Ød1 (mm)

Chamfer diameter

Ød3 (mm)

 Radius
R (mm)
Ød1 ≤ 10,0 Ød1 - 1,50 2,00
10,0 < Ød1 ≤ 20,0 Ød1 - 2,00 2,00
20,0 < Ød1 ≤ 30,0 Ød1 - 2,50 3,00
30,0 < Ød1 ≤ 40,0 Ød1 - 3,00 3,00
40,0 < Ød1 ≤ 50,0 Ød1 - 3,50 4,00
50,0 < Ød1 ≤ 70,0 Ød1 - 4,00 4,00
70,0 < Ød1 ≤ 95,0 Ød1 - 4,50 5,00
95,0 < Ød1 ≤ 130,0 Ød1 - 5,50 6,00
130,0 < Ød1 ≤ 240,0 Ød1 - 7,00 8,00
240,0 < Ød1 ≤ 500,0 Ød1 - 11,00 12,00

Shaft runout

Shaft runout corresponds to a deviation between the real axis of the shaft and the theoretical axis of rotation. It is important to minimize shaft runout by positioning the seal ring as close as possible to the bearing. The table below describes the maximum permissible values ​​depending on the rotation speed and the material of the sealing lip.

Shaft run-out for shaft seals with spring

Eccentricity


The shaft and housing must be mounted centered in relation to each other to eliminate any one-sided radial loading at the sealing lip of the ring. This joint can tolerate 0.05 to 0.10 mm of coaxiality defect depending on the diameter of the shaft.

 

Housing design

Schema_implantation_86C

Surface conditions

The surface quality of the accommodation must take into account the recommendations below.

Standard conditions for elastomer coated bushings:

  • Ra = 0.8 µm
  • Rz = 1.6 µm

 

Housing Bore Diameter Tolerance

The housing bore diameter must be tolerance H8 according to ISO 286-2

Bore diameter
ØD1 (mm)

Tolerance
H8 (mm)
3,0 < ØD1 ≤ 6,0 0 / +0,018
6,0 < ØD1 ≤ 10,0 0 / +0,022
10,0 < ØD1 ≤ 18,0 0 / +0,027
18,0 < ØD1 ≤ 30,0 0 / +0,033
30,0 < ØD1 ≤ 50,0 0 / +0,039
50,0 < ØD1 ≤ 80,0 0 / +0,046
80,0 < ØD1 ≤ 120,0 0 / +0,054
120,0 < ØD1 ≤ 180,0 0 / +0,063
180,0 < ØD1 ≤ 250,0 0 / +0,072
250,0 < ØD1 ≤ 315,0 0 / +0,081
315,0 < ØD1 ≤ 400,0 0 / +0,089
400,0 < ØD1 ≤ 500,0 0 / +0,097
500,0 < ØD1 ≤ 630,0 0 / +0,110

Housing width dimensions

The table below provides information on the recommended groove width and radius.

Height
H1		 Width Radius
R2 max
L2min (H1x0,85) L1min (H1+0,3)
7,00 5,95 7,30 0,30
8,00 6,80 8,30
10,00 8,50 10,30
12,00 10,30 12,30 0,40
15,00 12,75 15,30
20,00 17,00 20,30

Assembly recommendations

Several essential rules must be respected before proceeding with the assembly of the joints.

  • Check that the mechanical parts (shaft and housing) have an entry chamfer.
  • Deburr and chamfer or round off sharp edges, cover threaded parts.
  • Remove machining chips and any impurities and other foreign particles
  • Thoroughly clean all mechanical parts.
  • If using assembly tools, check that they are clean and free of sharp edges.

Assembly diagram BECA 86A

Only on request